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/*******************************************************************************
* Copyright (c) 2014 Tasktop Technologies and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Tasktop Technologies - initial API and implementation
*******************************************************************************/
package org.eclipse.mylyn.reviews.core.spi;
import java.util.HashSet;
import java.util.Set;
import org.eclipse.emf.ecore.EAttribute;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EReference;
public class ModelUtil {
private final static int PRIME = 31;
public static int ecoreHash(EObject object) {
return ecoreHash(0, object);
}
public static int ecoreHash(int current, EObject object) {
return ecoreHash(current, object, new HashSet<EObject>());
}
private static int ecoreHash(int current, EObject object, Set<EObject> references) {
if (object != null) {
references.add(object);
for (EAttribute attribute : object.eClass().getEAllAttributes()) {
Object value = object.eGet(attribute);
if (value != null) {
current = PRIME * current + value.hashCode();
}
}
for (EReference reference : object.eClass().getEAllReferences()) {
Object value = object.eGet(reference);
if (value instanceof EObject && !references.contains(value)) {
current = ecoreHash(current, (EObject) value, references);
}
}
}
return current;
}
}
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